大约有 48,000 项符合查询结果（耗时：0.0320秒） [XML]
What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
...intf command.
With arrays, the rules are both similar and different.
If groups is an array, referencing $groups or ${groups} is tantamount to referencing ${groups[0]}, the zeroth element of the array.
Referencing "${groups[@]}" is analogous to referencing "$@"; it preserves the spacing in the ind...
How to use DISTINCT and ORDER BY in same SELECT statement?
...T. To do this, you need to use an aggregate function to sort on, and use a GROUP BY to make the DISTINCT work.
Try something like this:
SELECT DISTINCT Category, MAX(CreationDate)
FROM MonitoringJob
GROUP BY Category
ORDER BY MAX(CreationDate) DESC, Category
...
How to fix Error: laravel.log could not be opened?
...ged in with as owner and the webserver user (www-data, apache, ...) as the group.
You can try this:
sudo chown -R $USER:www-data storage
sudo chown -R $USER:www-data bootstrap/cache
then to set directory permission try this:
chmod -R 775 storage
chmod -R 775 bootstrap/cache
Update:
Webserver ...
ssh “permissions are too open” error
...d to run "chgrp Użytkownicy ~/.ssh/id_rsa" since "Users" errored no such group.
– Marcos
Sep 26 '14 at 18:44
I had t...
Laravel blank white screen
...solved this by making the app/storage directory writable by Apache (either group writable to "www-data", "apache" or world-writable - that depends on your server setup.
Web Server User
On Ubuntu/Debian servers, your PHP may be running as user "www-data". On CentOS/RedHat/Fedora servers, you PHP ma...
Order of items in classes: Fields, Properties, Constructors, Methods
...ations)
Properties
Indexers
Methods
Structs
Classes
Within each of these groups order by access: (SA1202)
public
internal
protected internal
protected
private
Within each of the access groups, order by static, then non-static: (SA1204)
static
non-static
Within each of the static/non-static...
What's the correct way to sort Python `import x` and `from x import y` statements?
The python style guide suggests to group imports like this:
6 Answers
6
...
Create array of regex matches
...e")
.matcher(yourStringHere);
while (m.find()) {
allMatches.add(m.group());
}
After this, allMatches contains the matches, and you can use allMatches.toArray(new String[0]) to get an array if you really need one.
You can also use MatchResult to write helper functions to loop over matc...
Python matplotlib multiple bars
...ou should either use a stacked bar chart (colours on top of each other) or group by date (a "fake" date on the x-axis, basically just grouping the data points).
import numpy as np
import matplotlib.pyplot as plt
N = 3
ind = np.arange(N) # the x locations for the groups
width = 0.27 # the wi...
GROUP BY to combine/concat a column [duplicate]
... FOR XML PATH (''))
, 1, 1, '') AS URLList
FROM TableName AS a
GROUP BY [User], Activity
SQLFiddle Demo
share
|
improve this answer
|
follow
|
...